Sumac. Of commerce, is the pulverized leaves and branches of a bushy tree, the Rhus.Coriaria, or elm-leaved sumach, which rises about ten feet high, is cultivated in Spain, Portugal, Sicily, and Palestine, for dyeing and tanning. The Spanish sumac is imported in skins, that from Sicily in bags ; it is esteemed good when its odour is strong, of a lively green colour, free from stems, and well ground. It is cultivated ■with great care by the Portuguese and Spaniards; its shoots are cut down every year close to the root, and after being dried and powdered in a mill, are ready for tanning or dyeing. Another species of this genus of plants, the Rhus Cotinus, is used by : the Spaniards for dyeing and tanning their yellow leather, which is both brilliant and durable. Preparations of this plant are used by the French dyers under the name of fustet and redoul. The green berries of the plants producing sumac are poisonous, and hence some caution should be taken by J dyers in using this dye. It is apprehended that a considerable quantity of the latter \ kind of sumac or fustet is sold in this country for